Ophthalmological instrument arm



FIG. 1 is a perspective view of an ophthalmological instrument arm, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for an ophthalmological instrument arm, as shown and described. 